What does 'Mil-Spec' mean for this harness?

Mil-Spec connectors are built to military specifications, meaning they are exceptionally durable, resistant to vibration, and designed for reliable connections in demanding environments. This translates to a more robust and dependable wiring harness for your engine swap.

What is the adapter required for?

The adapter is necessary to connect this specific harness, which is designed for 2002-2004 K20 OBD2 sensors, to your vehicle's ECU (Engine Control Unit). The type of adapter needed will depend on the specific ECU you are using for your engine swap.

What sensors does this harness support?

This harness is built to support the OBD2 sensors found on 2002-2004 K20 engines, commonly from the Honda RSX. It ensures proper connectivity for essential engine functions.

Rywire 02-04 Honda K-Series Mil-Spec Engine Harness w/OBD2 02-04 RSX K20 Sensors (Adapter Req)

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Specifications

Brand: Rywire
Part #: RY-K2-MILSPEC
UPC: 321654987

Rywire 02-04 Honda K-Series Mil-Spec Engine Harness w/OBD2 02-04 RSX K20 Sensors (Adapter Req)

Name: Rywire 02-04 Honda K-Series Mil-Spec Engine Harness w/OBD2 02-04 RSX K20 Sensors (Adapter Req)
Brand: Rywire
Price: 1142.40 USD
Availability: InStock

$1142.40

On Backorder — Expected to ship by Jun 7, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Rywire K-Series Mil-Spec Engine Harness for Honda K-Series engines. Built with Mil-Spec connectors for reliability.

Key Features

Fits 2002-2004 Honda K-Series engines with K20 motors.
Utilizes Mil-Spec connectors for enhanced durability and reliability.
Designed for OBD2 sensor compatibility with 2002-2004 RSX K20 sensors.
Simplifies engine wiring for K-series engine swaps.
Requires an adapter for ECU connection.

This harness is designed for 2002-2004 Honda K-Series engines using K20 motors and OBD2 sensors. An adapter is required for ECU connection.

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Product Details

If you're swapping a K-series engine into your Honda and need a reliable way to connect everything, this Rywire Mil-Spec engine harness is built for that job. It's designed to integrate K20 engines from 2002-2004, specifically those found in the RSX, and uses OBD2 sensor compatibility. This harness is a critical piece for getting your engine management system talking to your sensors and ECU, ensuring your swap runs smoothly.

Rywire uses Mil-Spec connectors, which are known for their robustness and ability to withstand vibration and harsh conditions. This means you're getting a well-built harness that's less likely to cause electrical gremlins down the road, especially in a performance application. The wiring is laid out to simplify installation, making the connection between your K-series engine and your vehicle's chassis straightforward. Keep in mind that while it's designed for OBD2 K20 sensors from 2002-2004, you will need an adapter to connect it to your specific ECU setup.

This harness is a significant investment in the reliability of your K-series swap. Ensure you have the correct adapter for your ECU, as this harness is designed to be a clean and durable solution for integrating your engine. It's a popular choice for builders who want a professional-looking and dependable wiring solution.